Mercedes W204 C220CDI OM646.811 170HP Engine ECU Kit A6461509372 2Keys Lock

Mercedes W204 C220CDI OM646.811 170HP Engine ECU Kit is a solution designed for vehicles with the OM646.811 diesel unit with 170 HP and an automatic transmission. The set belongs to the Electronic control modules and ECUs category, which means it is prepared to work with the vehicle's factory electrical architecture. Thanks to the inclusion of two keys and a lock, it provides a coherent package for a comprehensive replacement of the powertrain control electronics.

Specifications and technical data

• SKU: A6461509372-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6461509372
• Substitutable numbers: A6461509372, A 646 150 93 72, A2045451308, A 204 545 13 08, KD
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the ECU kit

The presented set is dedicated to the Mercedes C-Class W204 C220 CDI model with the 170 HP OM646.811 diesel engine, working in conjunction with an automatic transmission. The engine ECU is responsible for precise management of the powertrain's operation, including fuel injection, boost pressure control, starting strategy, and communication with other vehicle systems.

The presence of two keys and a lock in one package facilitates maintaining the consistency of the immobilizer system and vehicle electronics, which in practice reduces the need for extensive programming and matching of multiple components separately.

Benefits of using a complete kit

Using a complete ECU kit with keys and a lock in a car with a diesel engine and automatic transmission allows for a technically correct replacement of powertrain control components. In one package, you receive:

• an engine control module matched to the OM646.811 unit,
• a set of keys compatible with the vehicle's electronics,
• a lock associated with the car's security system.

This helps to reduce the risk of vehicle starting issues, immobilizer errors, or software incompatibility between individual modules. This is particularly important in modern powertrains, where the engine ECU communicates with many other controllers in the vehicle.

Technical characteristics regarding the powertrain

The set is intended for a vehicle with a diesel engine, which means that the software and controller configuration are prepared for the specifics of CDI unit operation – including common rail injection support, exhaust gas treatment regeneration strategies, and monitoring operating parameters for economy and durability. The set works with an automatic transmission, so the control logic accounts for communication with the transmission module, including torque management, driving modes, and powertrain protection.

Such matching is crucial when replacing a controller in a modern Mercedes – incorrect selection based on fuel type or transmission type can lead to communication errors, power limitations, or issues with smooth gear shifting.

Condition, origin, and practical application

The offered set comes from a used vehicle, which allows for an economical repair or replacement of a damaged controller in your Mercedes W204 C220 CDI. A used ECU kit with keys and a lock is often chosen as a service solution in situations where a brand-new controller is expensive or difficult to obtain. In practice, this enables the restoration of the engine control system's functionality while maintaining compliance with the vehicle's factory architecture.

Before installation, it is recommended to verify compatibility with the specific vehicle equipment version and consult with a workshop specializing in Mercedes electronics to properly carry out adaptation and any necessary coding.

Support in selection and additional information

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as controllers, comfort modules, or ECU units, check the available parts in the Mercedes electronic control modules and ECUs category.

To better understand how to safely select and install used engine controllers and other electronic modules, it is worth reading the guide on our blog: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?. You will find practical tips there regarding selection by OEM numbers, compatibility issues, and the most frequently asked questions related to the installation of used electronics.